Posts Tagged ‘hot rod front suspension’

1984-87 C4 Corvette Chassis Plans for the Model A Ford Hot Rod

Tuesday, May 6th, 2014
 

 

1984-87 C4 Corvette Chassis Plans for the Model A Ford Hot Rod

 

Below are a few sample drawing of the chassis / frame using the 1984 – 87  C4 Corvette suspension parts.  Click on the “Chassis Plan Page” link below for a complete set of measured drawings and pictures.

Street Rod Chassis Plans using C4 Corvette Suspension - 1
Street Rod Chassis Plans using C4 Corvette Suspension - 6
Street Rod Chassis Plans using C4 Corvette Suspension - 9

Building a hot rod, street rod, custom car, or rat rod is not an easy project to undertake. Using the suspension from the 1986 Corvette Indy Pace car convertible had its challenges. At the time so little information could be found for this type of chassis / frame design. While undertaking the build, I measured the original C4 Corvette cross member and rear end and recorded everything as I worked on the build. It was difficult, but a very rewarding challenge.
Purchasing the wrecked Corvette on eBay for my hot rod build was a very affordable method of obtaining the major components for the 1929 Ford roadster hot rod. In the end, I kept all of the suspension parts, motor, transmission, steering column, brake booster, and many other small parts. Everything else was sold, including the much stripped down wrecked Corvette shell. Very little was thrown away. The wheeling and dealing resulted in a tidy profit. The initial cost of the 1986 Corvette was recovered and a very healthy amount left over for the purchase of tools and parts required for the hot rod build. Who said that building a hot rod is expensive?
After giving this a considerable amount of thought, I decided to finish the measured drawing of the chassis / frame on ACAD and share them with other hot rod builders.  These plans would also be useful to other street rod, custom car, rat rod, or hot rod builders and adapting the design to your unique build.

If you feel that this information was useful please, consider making a donation.  It was a huge effort to create these drawings.

 

 

Below is a short video of the plans and pictures of various parts of the chassis / frame explaining a few of the build details.

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Installing the front coil over shocks in the 1929 Ford Hot Rod

Friday, May 21st, 2010
 
Installing the front coil over shocks in the 1929 Ford Hot Rod
 
 The C4 Corvette suspension that I removed form the 1986 Corvette Indy Pace car convertible has found a new home in the 1929 Ford Model A hot rod. Everything is just about complete on the hot rod chassis. My first attempt at designing and developing an upper shock mount for the coil over shocks just did not impress me. I felt the design was too bulky and awkward looking. Simply said, it was not a clean design. I am the sort of person that if I am not pleased with something, especially something I built, I need to fix it or I will always regret it if I don’t. With those thoughts in my mind, I decided to cut the upper coil over shock mounts from the chassis. Of course, this was no easy task. When I put something together, I tend to do it well. With the heavy welds around the entire shock mount, I was grinding for some time. After a few hours, I manage to remove the upper coil over shock mounts and nicely clean up the chassis. Now I was ready for a second attempt at this.
1929 Ford Hot Rod front coil over shock mount - view 1 - this was my first version of the upper coil over shock mount.  A shock from the rear suspension of a Jaguar XJ-12 was used.  It was the correct length and also seems to have the correct spring rate.

1929 Ford Hot Rod front coil over shock mount - view 1 - this was my first version of the upper coil over shock mount. A shock from the rear suspension of a Jaguar XJ-12 was used. It was the correct length and also seems to have the correct spring rate.

 

1929 Ford Hot Rod front coil over shock mount - view 2 - The upper mount just did not have the right look for me so it was removed.

1929 Ford Hot Rod front coil over shock mount - view 2 - The upper mount just did not have the right look for me so it was removed.

 

1929 Ford Hot Rod - Jaguar coil over shock - This shock has about 13.5 inch distance between mounting hole centers and is a perfect size to use on the front suspension of my hot rod.

1929 Ford Hot Rod - Jaguar coil over shock - This shock has about 13.5 inch distance between mounting hole centers and is a perfect size to use on the front suspension of my hot rod.

Originally I had a Jaguar independent rear end that came with four coil over shocks. I sold the rear end and kept the coil over shocks. This was part of the package that came with the 1931 Ford Model A 5 window coupe I previously purchased and sold. I found that these shocks had a perfect distance between the mounting holes and seemed to have the correct spring rate for the front of my 1929 Ford Model A hot rod. My intention is to use these coil over shocks temporally till I generated more funds for some nice chrome or aluminum coil over shocks.

1929 Ford Hot Rod - front lower coil over shock mount - version 1 - this is one possible mount that I am thinking of using, but still not sure.

1929 Ford Hot Rod - front lower coil over shock mount - version 1 - this is one possible mount that I am thinking of using, but still not sure.

 

1929 Ford Hot Rod - front lower coil over shock mount - version 2 - this another mount up for consideration and is the same as the lower mount I used on the rear shocks of my hot rod.  I am leaning towards this style, but made out of stainless steel instead.  Eventually, I intend to polish all of the aluminum suspension parts, have chrome coil over shocks, so this style of mount using stainless steel makes a bit of sense.

1929 Ford Hot Rod - front lower coil over shock mount - version 2 - this another mount up for consideration and is the same as the lower mount I used on the rear shocks of my hot rod. I am leaning towards this style, but made out of stainless steel instead. Eventually, I intend to polish all of the aluminum suspension parts, have chrome coil over shocks, so this style of mount using stainless steel makes a bit of sense.

 

The lower shock mount is basic. I used a triangle pattern for the base of the shock mount. A couple of half moon shaped brackets were welded to the base of the lower shock mount. All of these pieces where fabricated from 0.25 inch steel plate and cut out on my metal cutting band saw. To make sure for a perfect fit, I bolted the half moon brackets to the shock, and then positioned the shock with brackets onto the lower shock mount base. This was then tack welded in place. Once I was happy with the position and fit of the shock, the half moon brackets were permanently welded in place. This assembly fits perfectly into the lower control arm from the C4 Corvette. Another consideration for the lower shock mount is to fabricate one from 2 inch stainless stain square tubing and using small spacers inside to make up the difference between the width of the shock mount and the opening of the bracket. I am leaning more towards this style considering that I will eventually polish all of the aluminum suspension parts and use chrome coil over shocks.

1929 Ford Hot Rod front coil over shock mount - view 3 - I discovered that if I angled the shock in more towards the frame and directly under the upper control arm that my spring rate was not effected by much.

1929 Ford Hot Rod front coil over shock mount - view 3 - I discovered that if I angled the shock in more towards the frame and directly under the upper control arm that my spring rate was not effected by much.

 

1929 Ford Hot Rod front coil over shock mount - view 4 - A set of new upper shock mounts were made from 0.25 inch plate steel.  A always a template was created just in case I ever wanted to make more of these brackets.

1929 Ford Hot Rod front coil over shock mount - view 4 - A set of new upper shock mounts were made from 0.25 inch plate steel. A always a template was created just in case I ever wanted to make more of these brackets.

With the lower shock mount placed onto the lower control arm, I started to examine various mounting options for the upper shock mount. Very quickly I realized that I could create a much smaller mount just under the mounting bar of the upper control arm from the C4 Corvette. The only concern I had was that the angle of the shock was increasing slightly. The correction factor when mounting shocks on a 15 degree angle is 0.93 and for a 20 degree mounting angle is 0.88. This is approximately the change I wanted to introduce to the suspension. So to check things out, I was able to set the upper shock mount temporarily. I added a few sand bags as extra weight or ballast to compensate for parts still not on the chassis. Then I positioned my 250 pounds onto the chassis. I took a resting position measurement and another one when I started to bounce up and down on the chassis. This activity resulted in only a 1 inch movement in the suspension at the best of times. This seems reasonable to me so I then decided to create a second version of the upper shock mount. Once again to ensure a perfect fit, I bolted the newly fabricated upper shock mounts to the shocks. The complete coil over shock assembly was then fitted to the chassis. With everything in place, the upper shock mounts were tack welded to the chassis. Making sure that this was what I wanted this time and that the mounting positions were correct, I removed the upper control arm and shock for the final welding process of the upper mount.

1929 Ford Hot Rod front coil over shock mount - view 5 - The new brackets were bolted to the upper mount of the coil over shock.  With everything in place, the new mounts were tack welded to the frame.

1929 Ford Hot Rod front coil over shock mount - view 5 - The new brackets were bolted to the upper mount of the coil over shock. With everything in place, the new mounts were tack welded to the frame.

 

1929 Ford Hot Rod front coil over shock mount - view 6 - Everything looked as it should, my spring rate was not reduced my much with the increased angle of the coil over shock.

1929 Ford Hot Rod front coil over shock mount - view 6 - Everything looked as it should, my spring rate was not reduced my much with the increased angle of the coil over shock.

 

1929 Ford Hot Rod front coil over shock mount - view 7 - This new upper mount looks much better then my original version.

1929 Ford Hot Rod front coil over shock mount - view 7 - This new upper mount looks much better then my original version.

 

1929 Ford Hot Rod front coil over shock mount - view 8 - This is the finished and primed result of my efforts.  I think this doesn't look too bad.

1929 Ford Hot Rod front coil over shock mount - view 8 - This is the finished and primed result of my efforts. I think this doesn't look too bad.

 

1929 Ford Hot Rod front coil over shock mount - view 9 - The front suspension is painted for now and mounted back onto the frame.  Later on I intend to purchase a nice set of polished coil over shocks to replace the 1 inch square tube.

1929 Ford Hot Rod front coil over shock mount - view 9 - The front suspension is painted for now and mounted back onto the frame. Later on I intend to purchase a nice set of polished coil over shocks to replace the 1 inch square tube.

Standing back and looking at the new version of the upper shock mount, I felt the entire process was well worth the time and effort. In my mind the design was much cleaner looking. This outcome is in line with my over all goal with this project. It is to build a good looking, safe, and, have great handling characteristics hot rod with a minimum of expense. So far, I am right on track.

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